Toga To"ga, n.; pl. E. {Togas}, L. {Tog[ae]}. [L., akin to
tegere to cover. See {Thatch}.] (Rom. Antiq.)
The loose outer garment worn by the ancient Romans,
consisting of a single broad piece of woolen cloth of a shape
approaching a semicircle. It was of undyed wool, except the
border of the toga pr[ae]texta.
[1913 Webster]

{Toga pr[ae]texta}. [L.], a toga with a broad purple border,
worn by children of both sexes, by magistrates, and by
persons engaged in sacred rites.

{Toga virilis} [L.], the manly gown; the common toga. This
was assumed by Roman boys about the time of completing
their fourteenth year.
[1913 Webster]

toga — (n.) c.1600, from L. toga cloak or mantle, related to tegere to cover (see STEGOSAURUS (Cf. stegosaurus)). The outer garment of a Roman citizen in time of peace; toga prætexta had a broad purple border and was worn by children, magistrates,… … Etymology dictionary